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MHT CET202410 May 2024Morning ShiftChemistryAminesActual

Identify the correct decreasing order of pK _ b values of compounds from following.

Options

  1. ANH ₃ R - NH ₂ R ₂ NH
  2. BR ₂ NH R - NH ₂ NH ₃
  3. CR - NH ₂ R ₂ NH NH ₃
  4. DR ₂ NH NH ₃ R - NH ₂

Correct answer

A. NH ₃ R - NH ₂ R ₂ NH

Step-by-step solution

Basic strength increases as we move from NH ₃ to R - NH ₂ and from R - NH ₂ to R ₂ NH , but basic strength decreases as we move from R ₂ NH to R ₃ ~N . Order of basic strength: NH ₃ R - NH ₂ R ₂ NH Thus, Order of pK _ b values: NH ₃ R - NH ₂ R ₂ NH

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